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st: how to delete some observations


From   "Tumur Gunchinmaa" <t.gunchinmaa@student.manchester.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: how to delete some observations
Date   Mon, 7 Feb 2005 17:09:28 -0000

Dear all,
I would appreciate if you could give me some advice on the following

I had a data on market participation of households. The number of
times each household participates in the different markets varies
between the households. When I have reshape the data into a long
format the data became as follows:

ID		market		choice		price
1		a1			0			.
1		f1			0               .
1         s1              1               x
1         u1              0               .

1        a2               0               .
1         f2               0               .
1         s2              0               .
1         u2              0               .

2		a1			1			x
2		f1			0               .
2         s1              0               .
2         u1              0               .

2        a2               0               .
2         f2               0               .
2         s2              0               .
2         u2              1               x

So from the sample, household 1 traded only one time and
household 2 traded twice. What I would like to is hence household
1 traded only once, I need to delete the second set of observations
for this household making no changes to the observations of
household  2.

I have tried to do various options, but they did not work. I would
appreciate any help.

Thanks,
Gunche


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